A cooling system for a battery cluster

Abstract

The embodiment of the present application relates to the field of battery heat dissipation, and discloses a cooling system of a battery cluster.The battery cluster is composed of a plurality of battery packs in parallel, and each battery pack has a flow channel suitable for flowing cooling medium in the interior, and the cooling system comprises a liquid cooling unit and a liquid delivery pipe; the liquid cooling unit is connected with the flow channel in the interior of each battery pack through the liquid delivery pipe, and is used for delivering cooling medium to the flow channel to cool the battery cluster.The technical scheme provided by the present application solves the problems of temperature stratification in actual work, large difference in heat exchange rate at different positions of the battery cluster, high cooling cost and high water pump energy consumption of the cooling mode in the prior art, and the cooling system of the present application does not stratify temperature in actual work, and can improve the heat exchange rate, cooling cost and water pump energy consumption at different positions of the battery cluster.

Description

Technical Field

[0001] This invention relates to the field of battery heat dissipation, and particularly to a cooling system for a battery cluster. Background Technology

[0002] With the continuous development of the energy storage industry and the continuous improvement of battery pack energy density, the heat released by batteries during operation will increase, which means that the heat dissipation requirements for energy storage units will be higher in the future.

[0003] Currently, there are two main methods for heat dissipation in energy storage: forced air cooling and liquid cooling plates. However, both of these methods have their limitations, such as low heat exchange efficiency, poor control of maximum temperature and temperature uniformity, resulting in high temperature and large temperature difference inside the battery pack. Therefore, immersion cooling and phase change cooling methods will be more widely used as energy density continues to increase.

[0004] Currently, the commonly used immersion method uses a cooling insulating medium to fill the entire battery compartment or battery cluster. In actual operation, the temperature is layered, the heat exchange rate varies greatly at different locations of the battery cluster, and the cost and energy consumption of the water pump are high. Summary of the Invention

[0005] The purpose of this invention is to provide at least one cooling system for battery clusters, which can solve the problems of temperature stratification, large differences in heat exchange rates at different locations of the battery cluster, high cooling costs, and high water pump energy consumption in the existing cooling methods during actual operation. The invention can at least achieve temperature stratification during actual operation and improve the heat exchange rate, cooling cost, and water pump energy consumption at different locations of the battery cluster.

[0006] To solve the above-mentioned technical problems, at least one embodiment of this application provides a cooling system for a battery cluster, wherein the battery cluster is composed of multiple battery packs connected in parallel, and each battery pack has a flow channel suitable for the flow of a cooling medium inside, and the cooling system includes: a liquid cooler unit and a liquid delivery pipe;

[0007] The liquid cooling unit is connected to the internal flow channel of each battery pack via the liquid delivery pipe, and is used to deliver cooling medium to the flow channel to cool the battery cluster.

[0008] This application provides a cooling system for a battery cluster, wherein the battery cluster is composed of multiple battery packs connected in parallel, and each battery pack has a flow channel suitable for the flow of a cooling medium. The cooling system includes a liquid chiller and a liquid delivery pipe. The liquid chiller is connected to the flow channel inside each battery pack through the liquid delivery pipe, and is used to deliver a cooling medium to the flow channel to cool the battery cluster. This system can prevent temperature stratification during actual operation, and can improve the heat exchange rate at different locations of the battery cluster, reduce cooling costs, and decrease water pump energy consumption.

[0009] Additionally, the battery pack includes: a housing, a flow channel plate, a battery module, and a housing cover;

[0010] The flow channel plate is disposed on the side wall inside the box body, and is suitable for the cooling medium to flow in the flow channel;

[0011] The battery module is placed inside the housing; the housing cover is located on the top of the housing and is detachably connected to the housing.

[0012] The cooling medium flows into the battery pack, allowing the battery modules to be fully immersed in it, thus cooling them down. The flow channel plate guides the flow of the cooling medium, dividing it into multiple branches to maintain a consistent temperature around the battery modules, resulting in rapid and uniform cooling. The cooling medium flows through the flow channel plates located on the side walls inside the battery pack, immersing the battery modules and carrying away heat, thereby enhancing the safety, reliability, and stability of the battery pack.

[0013] In addition, the box is equipped with a liquid inlet, a liquid outlet, an overflow outlet, and a drain outlet;

[0014] The inlet is fixedly connected to the inlet pipe and is adapted to deliver cooling medium into the battery pack; the outlet is fixedly connected to the inlet pipe and is adapted to allow the cooling medium inside the battery pack to flow out.

[0015] When the liquid level of the cooling medium inside the battery pack is higher than the overflow port, the cooling medium is discharged from the battery pack through the overflow port; the drain port is adapted to discharge the cooling medium inside the battery pack.

[0016] The inlet and outlet ports on the casing allow the cooling medium to circulate within the battery pack, carrying away heat and saving on cooling medium usage. The overflow port on the casing allows the cooling medium to be discharged outside the battery pack when its height inside the pack exceeds the overflow port, preventing damage to the battery from the cooling medium inside the pack.

[0017] In addition, the liquid cooling unit includes: an external circulation module and an internal circulation module;

[0018] The external circulation module is fixedly connected to the battery cluster, and the interior of the external circulation module is adapted to circulate a cooling medium.

[0019] The internal circulation module is fixedly connected to the external circulation module, and the interior of the internal circulation module is adapted to circulate refrigerant.

[0020] In this process, heat exchange occurs between the cooling medium in the external circulation module and the refrigerant in the internal circulation module of the liquid-cooled unit. This allows the refrigerant to absorb heat from the cooling medium, enabling it to cool the battery pack again after the heat in the cooling medium has been absorbed by the refrigerant.

[0021] Additionally, the external circulation module includes: a heater and a water pump;

[0022] One end of the heater is fixedly connected to the liquid inlet pipe, and the other end of the heater is fixedly connected to the internal circulation module, which is suitable for heating the cooling medium;

[0023] One end of the water pump is fixedly connected to the outlet pipe, and the other end of the water pump is fixedly connected to the inner circulation module, which is suitable for providing power for the cooling medium to circulate in the outer circulation module.

[0024] The heater can heat the cooling medium in the external circulation module. Since the temperature difference between the cooling medium and the refrigerant has a great influence on the heat exchange efficiency during the heat exchange process, appropriately increasing the temperature of the cooling medium can increase the temperature difference between the cooling medium and the refrigerant, thereby improving the heat exchange efficiency. The water pump can promote the circulation of the cooling medium in the external circulation system, thereby maintaining the stable operation of the cooling system.

[0025] Additionally, the internal circulation module includes: a compressor, a condenser, an electronic expansion valve, and an evaporator;

[0026] One end of the compressor is fixedly connected to the evaporator, and the other end of the compressor is fixedly connected to the condenser, which is suitable for compressing the refrigerant into a high-temperature and high-pressure gas;

[0027] One end of the condenser is fixedly connected to the compressor, and the other end of the condenser is fixedly connected to the electronic expansion valve, which is suitable for reducing the temperature of the gas;

[0028] One end of the electronic expansion valve is fixedly connected to the condenser, and the other end of the electronic expansion valve is fixedly connected to the evaporator, which is suitable for depressurizing the gas and turning the gas into a gas-liquid mixture;

[0029] One end of the evaporator is fixedly connected to the external circulation module, and the other end is fixedly connected to the compressor, so that when both the refrigerant and the cooling medium circulate into the evaporator, the refrigerant absorbs heat from the cooling medium in the evaporator.

[0030] The system utilizes a compressor to compress the refrigerant into a high-temperature, high-pressure gas, thereby increasing its pressure and temperature and providing power for its circulation within the internal circulation module. In the condenser, the high-temperature, high-pressure refrigerant gas condenses into a liquid through heat exchange with the external environment. During this process, the refrigerant transfers the heat absorbed in the compressor and the heat generated during its own compression to the outside, causing it to change from a gaseous to a liquid state. This allows the refrigerant to function more effectively in subsequent operations, thus improving the overall efficiency of the cooling system. An electronic expansion valve further enhances the cooling system's performance. The electronic expansion valve exhibits very small opening changes, allowing for precise adjustment of the refrigerant flow rate according to the actual needs of the battery pack's cooling system. It can also quickly and accurately adjust its opening based on changes in parameters such as ambient temperature, system pressure, and refrigerant flow rate, ensuring the refrigerant flow rate adapts to actual operating conditions and improving the efficiency of the battery pack's cooling system. The evaporator enables the refrigerant to evaporate rapidly and absorb heat from the cooling medium, thereby improving heat exchange efficiency. This, in turn, allows the cooling medium to cool the battery cells in the battery module, preventing overheating and damage to the battery pack and ensuring its normal operation.

[0031] In addition, the liquid cooling unit is equipped with multiple valves.

[0032] Among them, by installing valves in the liquid cooling unit, the flow rate of the cooling medium or refrigerant can be precisely adjusted.

[0033] In addition, the liquid cooling unit is also equipped with multiple pressure sensors.

[0034] Among them, the pressure sensor can provide real-time feedback on the pressure information of the pipeline in the liquid chiller unit. Once the pressure sensor detects an abnormal pressure, it can adjust the delivery power of the water pump or regulate the valves on the pipeline in a timely manner, thereby preventing the pipeline in the liquid chiller unit from rupturing and ensuring the normal delivery of the cooling medium or refrigerant in the pipeline.

[0035] In addition, the infusion tube includes: an inlet tube and an outlet tube;

[0036] The liquid inlet pipe is fixedly connected to the liquid inlet of each battery pack and the liquid outlet of the liquid cooler unit, respectively.

[0037] The liquid outlet pipe is fixedly connected to the liquid outlet of each of the battery packs and the liquid inlet of the liquid cooling unit.

[0038] The system utilizes an inlet pipe to deliver the cooling medium circulating from the liquid-cooled unit to the battery pack, where it flows and removes heat. Conversely, an outlet pipe returns the cooling medium, now cooled by the heat removal process, to the liquid-cooled unit, allowing for heat exchange between the medium and refrigerant. This inlet and outlet pipes enable rapid delivery of the cooling medium while conserving its volume.

[0039] In addition, a flow meter is provided on the inlet pipe, which is suitable for monitoring the flow rate of the cooling medium in the inlet pipe.

[0040] The flow meter installed on the inlet pipe can measure the flow rate of the cooling medium entering the battery pack. Based on the actual heat dissipation requirements of the battery pack, the flow rate of the cooling medium can be automatically adjusted by regulating the valve to optimize the operation of the battery pack cooling system. This helps to improve energy utilization efficiency and reduce cooling costs. Attached Figure Description

[0041] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0042] Figure 1 This is a schematic diagram of the structure of a cooling system for a battery cluster provided in an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of a battery pack housing with a flow channel plate provided in an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the structure of the liquid inlet, liquid outlet, overflow port and drain port of the battery pack provided in the embodiments of this application;

[0046] Figure 5 This is another structural schematic diagram of a battery cluster cooling system provided in an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of a flow meter installed on an infusion tube according to an embodiment of this application.

[0048] Explanation of icon numbers:

[0049] 1. Battery cluster; 11. Battery pack; 111. Housing; 1111. Liquid inlet; 1112. Liquid outlet; 1113. Overflow outlet; 1114. Drain outlet; 112. Flow channel plate; 113. Battery module; 114. Housing cover; 2. Liquid cooling unit; 21. External circulation module; 211. Heater; 212. Water pump; 22. Internal circulation module; 221. Compressor; 222. Condenser; 223. Electronic expansion valve ; 224. Evaporator; 225. Dryer filter; 23. Valve; 231. First shut-off valve; 232. Second shut-off valve; 233. First needle valve; 234. Second needle valve; 24. Pressure sensor; 241. First pressure sensor; 242. Second pressure sensor; 243. Third pressure sensor; 244. Fourth pressure sensor; 3. Infusion tube; 31. Inlet tube; 32. Outlet tube; 4. Flow meter. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand the present invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0051] The purpose of this application is to provide a low-cost, high-efficiency cooling system for battery packs to solve the problems of high battery pack temperature and large temperature difference in existing heat dissipation technologies.

[0052] Example 1:

[0053] Embodiments of the present invention relate to a cooling system for a battery cluster.

[0054] Compared to existing technologies, the embodiments of this invention involve a battery cluster composed of multiple battery packs connected in parallel. Each battery pack has an internal flow channel suitable for the flow of a cooling medium. The cooling system includes a liquid chiller and a liquid delivery pipe. The liquid chiller is connected to the internal flow channel of each battery pack via the liquid delivery pipe to deliver a cooling medium to the flow channel, thereby cooling the battery cluster. The technical solution provided by this invention solves the problems of temperature stratification, large differences in heat exchange rates at different locations within the battery cluster, high cooling costs, and high water pump energy consumption in existing cooling methods during actual operation.

[0055] The following is a detailed description of the implementation details of a battery cluster cooling system according to this embodiment. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0056] like Figure 1As shown, an embodiment of the present invention provides a cooling system for a battery cluster. The battery cluster 1 is composed of multiple battery packs 11 connected in parallel. Each battery pack 11 has a flow channel suitable for the flow of a cooling medium inside. The cooling system includes: a liquid cooler unit 2 and a liquid delivery pipe 3.

[0057] The liquid cooling unit 2 is connected to the internal flow channel of each battery pack 11 through the liquid delivery pipe 3, and is used to deliver cooling medium to the flow channel to cool the battery cluster 1.

[0058] In a specific implementation, the battery cluster 1 can be composed of at least 5 battery packs 11 connected in parallel. The cooling system of the battery cluster can consist of the battery cluster 1, two rows of liquid delivery pipes 3, and a liquid chiller unit with a cooling capacity of 2kW.

[0059] The battery packs 11 are interconnected, ensuring temperature consistency and flow uniformity of the cooling medium entering the battery packs 11. The outer diameter of the infusion pipe 3 is preferably 31.8 mm. The cooling medium is preferably hydrocarbon synthetic oil, and the supply flow rate of the cooling medium can be 15 L / min.

[0060] This embodiment provides a cooling system for a battery cluster. The battery cluster 1 is composed of multiple battery packs 11 connected in parallel. Each battery pack 11 has an internal flow channel suitable for the flow of a cooling medium. The cooling system includes a liquid cooler unit 2 and a liquid delivery pipe 3. The liquid cooler unit 2 is connected to the internal flow channel of each battery pack 11 through the liquid delivery pipe 3, and is used to deliver a cooling medium to the flow channel to cool the battery cluster 1. The technical solution provided by this invention solves the problems of temperature stratification, large differences in heat exchange rates at different locations of the battery cluster, high cooling costs, and high water pump energy consumption in the existing cooling methods during actual operation. The cooling system of this application does not cause temperature stratification during actual operation, and can improve the heat exchange rate at different locations of the battery cluster, reduce cooling costs, and decrease water pump energy consumption.

[0061] Example 2:

[0062] The embodiments of the present invention are a detailed description of the battery pack 11 described above, see [link to documentation]. Figures 2 to 4 The battery pack 11 may include: a housing 111, a flow channel plate 112, a battery module 113, and a housing cover 114;

[0063] The flow channel plate 112 is provided on the side wall inside the housing 111, which is suitable for the flow of cooling medium in the flow channel;

[0064] The battery module 113 is placed inside the housing 111; the housing cover 114 is located on the top of the housing 111 and is detachably connected to the housing 111.

[0065] Specifically, after the cooling medium flows into the battery pack 11, it allows the battery module 113 to be fully immersed in the cooling medium, thereby cooling the battery module 113. Since the battery module 113 is in direct contact with the cooling medium, it can achieve direct, efficient, and rapid cooling, resulting in high cooling efficiency. The flow channel plate 112 can guide the flow of the cooling medium, dividing it into multiple branches to maintain a consistent temperature around the battery module 113, thus rapidly and uniformly cooling the battery module 113 and enhancing the safety, reliability, and stability of the battery pack.

[0066] The housing 111 is provided with an inlet 1111, an outlet 1112, an overflow outlet 1113 and a drain outlet 1114;

[0067] The inlet 1111 is fixedly connected to the inlet pipe 3 and is suitable for supplying cooling medium into the battery pack 11; the outlet 1112 is fixedly connected to the inlet pipe 3 and is suitable for the cooling medium in the battery pack 11 to flow out.

[0068] When the liquid level of the cooling medium inside the battery pack 11 is higher than the overflow port 1113, the cooling medium is discharged from the battery pack 11 through the overflow port 1113; the drain port 1114 is suitable for discharging the cooling medium inside the battery pack 11.

[0069] Specifically, the liquid inlets 1111 of each battery pack 11 can be spaced approximately 300 mm apart, and the liquid inlets 1111 of the battery pack 11 can be connected to the infusion tube 3 via a CQC-14 quick-connect fitting.

[0070] After the cooling medium flows in from the inlet 1111 of the battery pack 11, it flows through the flow channels on the inner side wall of the battery pack 11 and the flow channels between the cells in the battery module 113, and then flows out from the outlet 1112. It achieves external circulation through the liquid delivery pipe 2. The cooling medium that has been heated after flowing through the battery pack 11 flows through the evaporator 224 inside the liquid cooling unit 2 and is cooled down.

[0071] The inlet and outlet ports on the casing allow the cooling medium to circulate within the battery pack, carrying away heat and saving on cooling medium usage. The overflow port on the casing allows the cooling medium to be discharged outside the battery pack when its height inside the pack exceeds the overflow port, preventing damage to the battery from internal cooling medium.

[0072] In this embodiment, the battery pack 11 is provided with an inlet 111, an outlet 112, an overflow outlet 113, and a drain outlet 114. When the liquid level of the cooling medium inside the battery pack 11 is higher than the height of the overflow outlet on the battery pack 11, the cooling medium is discharged from the overflow outlet 113. The drain outlet 114 is used to discharge the cooling medium inside the battery pack. The cooling medium enters the battery pack 11 from the external circulation module 21 through the inlet 111. The side wall of the battery pack 11 is provided with a flow channel plate 112. The cooling medium enters from the inlet... After entering the battery pack 11, the cooling medium flows through the flow channel of the flow plate 112 into the area where the battery module 113 is located in the battery pack 11. The cooling medium is in direct contact with the battery module 113. The heat dissipated by the cells in the battery module 113 during charging and discharging is carried away by the cooling medium. After the cells and the cooling medium complete the heat exchange, the cooling medium flows out through the outlet 112 of the battery pack 11 and enters the external circulation module. The battery packs 11 are connected in parallel, so when cooling each battery pack 11, the battery packs 11 do not affect each other.

[0073] Example 3:

[0074] The embodiments of the present invention are a detailed description of the above-described liquid-cooled unit 2, see [link to documentation]. Figure 5 The liquid cooling unit 2 may include: an external circulation module 21 and an internal circulation module 22;

[0075] The external circulation module 21 is fixedly connected to the battery cluster 13, and the interior of the external circulation module 21 is suitable for circulating cooling medium;

[0076] The internal circulation module 22 is fixedly connected to the external circulation module 21, and the interior of the internal circulation module 22 is suitable for circulating refrigerant.

[0077] Heat exchange occurs between the cooling medium in the external circulation module of the liquid-cooled unit and the refrigerant in the internal circulation system, allowing the refrigerant to absorb heat from the cooling medium. This heat absorption by the refrigerant then cools the battery pack again.

[0078] The external circulation module 21 includes: a heater 211 and a water pump 212;

[0079] One end of heater 211 is fixedly connected to liquid inlet pipe 31, and the other end of heater 211 is fixedly connected to internal circulation module 22, which is suitable for heating cooling medium;

[0080] One end of the water pump 212 is fixedly connected to the liquid outlet pipe 32, and the other end of the water pump 212 is fixedly connected to the inner circulation module 22, which is suitable for providing power for the cooling medium to circulate in the outer circulation module.

[0081] Specifically, the heater 212 can be a 3kW (kilowatt) power heater 212. The water pump 212 can adjust its operating power according to the real-time feedback temperature data of the battery pack 11, thereby saving the energy consumption of the water pump 212.

[0082] The heater can heat the cooling medium in the external circulation module. Since the temperature difference between the cooling medium and the refrigerant has a great influence on the heat exchange efficiency during the heat exchange process, appropriately increasing the temperature of the cooling medium can increase the temperature difference between the cooling medium and the refrigerant, thereby improving the heat exchange efficiency. The water pump can promote the circulation of the cooling medium in the external circulation system, thereby maintaining the stable operation of the cooling system.

[0083] The internal circulation module 22 includes: a compressor 221, a condenser 222, an electronic expansion valve 223, and an evaporator 224;

[0084] One end of the compressor 221 is fixedly connected to the evaporator 224, and the other end of the compressor 221 is fixedly connected to the condenser 222, which is suitable for compressing the refrigerant into a high-temperature and high-pressure gas;

[0085] One end of the condenser 222 is fixedly connected to the compressor 221, and the other end of the condenser 222 is fixedly connected to the electronic expansion valve 223, which is suitable for reducing the temperature of the gas.

[0086] One end of the electronic expansion valve 223 is fixedly connected to the condenser 222, and the other end of the electronic expansion valve 223 is fixedly connected to the evaporator 224. It is suitable for depressurizing the gas, so that the gas is converted into a gas-liquid mixture.

[0087] One end of the evaporator 224 is fixedly connected to the external circulation module 21, and the other end is fixedly connected to the compressor 221, so that when both the refrigerant and the cooling medium circulate into the evaporator 224, the refrigerant absorbs heat from the cooling medium in the evaporator 224.

[0088] It is worth noting that the cooling medium circulating in the external circulation module 21 and the refrigerant circulating in the internal circulation module 22 exchange heat at the evaporator 224, and the cooling medium and refrigerant do not come into contact.

[0089] Specifically, the compressor 221 compresses the refrigerant into a high-temperature, high-pressure gas, thereby increasing the refrigerant's pressure and temperature and providing power for its circulation in the internal circulation module. In the condenser 222, the high-temperature, high-pressure refrigerant gas condenses into a liquid through heat exchange with the external environment. During this process, the refrigerant transfers the heat absorbed in the compressor 221 and the heat generated during its own compression to the outside, causing the refrigerant to change from a gaseous to a liquid state. This allows the refrigerant to function more effectively in subsequent operations, thus improving the overall efficiency of the cooling system. The electronic expansion valve 223 enables... The electronic expansion valve 223 allows for precise adjustment of the refrigerant flow rate based on the actual needs of the battery pack's cooling system, with only a small change in opening. It can also quickly and accurately adjust its opening based on changes in ambient temperature, system pressure, and refrigerant flow rate, adapting the refrigerant flow rate to actual operating conditions and improving the efficiency of the battery pack's cooling system. The evaporator 224 enables the refrigerant to evaporate rapidly and absorb heat from the cooling medium, thereby improving heat exchange efficiency. This, in turn, allows the cooling medium to cool the battery cells of the battery module 113 in the battery pack 11, preventing overheating and damage to the battery pack 11 and ensuring its normal operation.

[0090] It should be noted that the internal circulation module 22 may also include a dryer filter 225, one end of which is fixedly connected to the condenser 222, and the other end of which is fixedly connected to the electronic expansion valve 223. It is suitable for filtering out moisture and particulate matter and other impurities in the gas. This can prevent these impurities from causing blockage or malfunction to the pipes or equipment of the cooling system.

[0091] The liquid cooling unit 2 is also equipped with multiple valves 23.

[0092] Specifically, such as Figure 5 As shown, a first shut-off valve 231 can be installed between the heater 211 and the liquid inlet of the battery pack 11, and a second shut-off valve 232 can be installed between the water pump 212 and the liquid outlet of the battery pack 11. The pipelines and liquid delivery pipes 2 inside the liquid cooling unit 3 can be cut off by the shut-off valves.

[0093] A first needle valve 233 can be installed between the evaporator 224 and the compressor 221, and a second needle valve 234 can be installed between the condenser 222 and the dryer filter 225. By installing these valves, the flow rate of the cooling medium or refrigerant can be precisely adjusted.

[0094] The liquid cooling unit 2 is also equipped with multiple pressure sensors 24.

[0095] Specifically, such as Figure 5As shown, a first pressure sensor 241 can be installed between the heater and the battery pack inlet, a second pressure sensor 242 can be installed between the water pump and the battery pack outlet, a third pressure sensor 243 can be installed between the evaporator 224 and the compressor 221, and a fourth pressure sensor 244 can be installed between the compressor 221 and the condenser 222. These pressure sensors 24 can provide real-time feedback on the pressure information of the pipes in the liquid-cooled unit. Once the pressure sensor 24 detects an abnormal pressure, it can promptly adjust the delivery power of the water pump 212 or regulate the valve 23 on the pipe, thereby preventing the pipes in the liquid-cooled unit 2 from rupturing and ensuring the normal delivery of the cooling medium or refrigerant within the pipes.

[0096] It should be noted that the above-mentioned components can be connected by pipelines.

[0097] Example 4:

[0098] The embodiments of the present invention are a detailed description of the above-described infusion tube 3, see [link to documentation]. Figure 6 The infusion tube 3 may include: an inlet tube 31 and an outlet tube 32;

[0099] The liquid inlet pipe 31 is fixedly connected to the liquid inlet 1112 of each battery pack 11 and the liquid outlet of the liquid cooling unit 2.

[0100] The liquid outlet pipe 32 is fixedly connected to the liquid outlet 1113 of each battery pack 11 and the liquid inlet of the liquid cooling unit 2.

[0101] Specifically, the cooling medium circulating from the liquid-cooled unit 2 can be transported to the battery pack 11 through the inlet pipe 31, where it flows and removes heat from the battery pack 11. The cooling medium, having removed heat from the battery pack 11, can be transported to the liquid-cooled unit 3 through the outlet pipe 32, allowing heat exchange between the cooling medium and the refrigerant. Transporting the cooling medium through the inlet and outlet pipes 31 and 32 enables rapid delivery of the cooling medium while conserving its quantity.

[0102] The inlet pipe 31 is equipped with a flow meter 4, which is suitable for monitoring the flow rate of the cooling medium in the inlet pipe 31.

[0103] Specifically, the flow meter 4 installed on the inlet pipe can measure the flow rate of the cooling medium entering the battery pack 11. Based on the actual heat dissipation requirements of the battery pack 11, the flow rate of the cooling medium can be automatically adjusted by regulating the valve 24 to optimize the operation of the battery pack cooling system. This helps to improve energy utilization efficiency and reduce cooling costs.

[0104] In one alternative embodiment, the cooling system for the battery cluster operates as follows:

[0105] After exchanging heat with the refrigerant in the internal circulation system 22 of the liquid cooling unit 2, the cooling medium that transfers heat to the refrigerant is transported from the inlet 1111 of the battery pack 11 through the inlet pipe 31 of the liquid delivery pipe 2 to the inside of each battery pack 11 of the battery cluster 1, so that the battery modules 113 of the battery pack 11 are completely immersed in the cooling medium. The cooling medium carries away the heat of the cells in the battery modules 113. The cooling medium is guided by the flow channel plate 112 inside the battery pack 11 and flows out from the outlet 1112 of the battery pack 11, and enters the external circulation module 21 of the liquid cooling unit 2. The cooling medium that has absorbed the heat of the cells in the battery modules 113 of the battery pack 11 exchanges heat with the refrigerant circulating in the internal circulation module 22 of the liquid cooling unit 2 in the evaporator 224 of the liquid cooling unit 2. The refrigerant absorbs the heat in the cooling medium. The cooled cooling medium continues to circulate in the external circulation module 21, ready to cool the battery pack 11 for the next time.

[0106] The refrigerant, having absorbed heat from the cooling medium, enters the compressor 221 from the evaporator 224. The compressor 221 compresses the refrigerant into a high-temperature, high-pressure refrigerant gas, which then enters the condenser 222. The condenser 222 processes the high-temperature, high-pressure refrigerant gas into a low-temperature, high-pressure gas. After passing through the dryer filter 225 to remove impurities, the gas enters the electronic expansion valve for depressurization, becoming a low-temperature, low-pressure gas-liquid mixture. This mixture then enters the evaporator 224, ready to exchange heat with the cooling medium that has been circulated back to the evaporator 224 via the external circulation module 21.

[0107] This application employs immersion cooling within the battery pack 11, which improves the heat exchange efficiency of the heating elements and helps reduce the maximum temperature and temperature difference of the cells inside the battery pack. This application does not use full immersion cooling, saving on cooling medium and system costs. This application uses a fully enclosed design, avoiding the problem of cooling medium oxidation. This application can intelligently adjust the water pump power according to the cell temperature, which helps save system energy consumption and maintain a constant battery pack temperature. The cooling system of the battery cluster described in this application has a low-temperature heating function, and through the heater 211 in the external circulation module 21 of the liquid cooling unit 2, it can achieve normal operation in low-temperature environments.

[0108] It should be understood that the terms "mechanism," "device," "component," etc., used in this application are merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they can be replaced by other expressions.

[0109] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention. In practical applications, the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification, and various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A cooling system for a battery cluster, characterized in that, The battery cluster is composed of multiple battery packs connected in parallel. Each battery pack has a flow channel suitable for the flow of cooling medium inside. The cooling system includes a liquid cooler unit and a liquid delivery pipe. The liquid cooling unit is connected to the internal flow channel of each battery pack via the liquid delivery pipe, and is used to deliver cooling medium to the flow channel to cool the battery cluster.

2. The cooling system for the battery cluster according to claim 1, characterized in that, The battery pack includes: a housing, a flow channel plate, a battery module, and a housing cover; The flow channel plate is disposed on the side wall inside the box body, and is suitable for the cooling medium to flow in the flow channel; The battery module is placed inside the housing; the housing cover is located on the top of the housing and is detachably connected to the housing.

3. The cooling system for the battery cluster according to claim 2, characterized in that, The box is equipped with a liquid inlet, a liquid outlet, an overflow outlet, and a drain outlet; The inlet is fixedly connected to the inlet pipe and is adapted to deliver cooling medium into the battery pack; the outlet is fixedly connected to the inlet pipe and is adapted to allow the cooling medium inside the battery pack to flow out. When the liquid level of the cooling medium inside the battery pack is higher than the overflow port, the cooling medium is discharged from the battery pack through the overflow port; the drain port is adapted to discharge the cooling medium inside the battery pack.

4. The cooling system for the battery cluster according to claim 1, characterized in that, The liquid cooling unit includes: an external circulation module and an internal circulation module; The external circulation module is fixedly connected to the battery cluster, and the interior of the external circulation module is adapted to circulate a cooling medium. The internal circulation module is fixedly connected to the external circulation module, and the interior of the internal circulation module is adapted to circulate refrigerant.

5. The cooling system for the battery cluster according to claim 4, characterized in that, The external circulation module includes: a heater and a water pump; One end of the heater is fixedly connected to the liquid inlet pipe, and the other end of the heater is fixedly connected to the internal circulation module, which is suitable for heating the cooling medium; One end of the water pump is fixedly connected to the outlet pipe, and the other end of the water pump is fixedly connected to the inner circulation module, which is suitable for providing power for the cooling medium to circulate in the outer circulation module.

6. The cooling system for the battery cluster according to claim 4, characterized in that, The internal circulation module includes: a compressor, a condenser, an electronic expansion valve, and an evaporator; One end of the compressor is fixedly connected to the evaporator, and the other end of the compressor is fixedly connected to the condenser, which is suitable for compressing the refrigerant into a high-temperature and high-pressure gas; One end of the condenser is fixedly connected to the compressor, and the other end of the condenser is fixedly connected to the electronic expansion valve, which is suitable for reducing the temperature of the gas; One end of the electronic expansion valve is fixedly connected to the condenser, and the other end of the electronic expansion valve is fixedly connected to the evaporator, which is suitable for depressurizing the gas so that the gas is converted into a gas-liquid mixture; One end of the evaporator is fixedly connected to the external circulation module, and the other end is fixedly connected to the compressor, so that when both the refrigerant and the cooling medium circulate into the evaporator, the refrigerant absorbs heat from the cooling medium in the evaporator.

7. The cooling system for the battery cluster according to claim 1, characterized in that, The liquid cooling unit is also equipped with multiple valves.

8. The cooling system for the battery cluster according to claim 1, characterized in that, The liquid cooling unit is also equipped with multiple pressure sensors.

9. The cooling system for the battery cluster according to claim 1, characterized in that, The infusion tube includes: an inlet tube and an outlet tube; The liquid inlet pipe is fixedly connected to the liquid inlet of each battery pack and the liquid outlet of the liquid cooling unit, respectively. The liquid outlet pipe is fixedly connected to the liquid outlet of each of the battery packs and the liquid inlet of the liquid cooling unit.

10. The cooling system for the battery cluster according to claim 9, characterized in that, A flow meter is installed on the inlet pipe, and the flow meter is suitable for monitoring the flow rate of the cooling medium in the inlet pipe.

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